Sends a signal to a process. The format for the $ZSIGPROC function is:

$ZSIGPROC(expr1,expr2)
[Caution]Caution

Although $ZSIGPROC() may work today as a way to invoke the asynchronous interrupt mechanism of GT.M processes to XECUTE $ZINTERRUPT because the underlying mechanism uses the POSIX USR1 signal, FIS reserves the right to change the underlying mechanism to suit its convenience and sending a POSIX USR1 may cease to work as a way to invoke the asynchronous interrupt mechanism. Use MUPIP INTRPT as the supported and stable API to invoke the asynchronous interrupt mechanism.

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